Timber Floor Joist Spans

A few of the most common factors that affect joist span include.

Timber floor joist spans.

Also available for the android os. View size selection tables. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. View allowable load tables.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. 1 psf lb f ft 2 47 88 n m 2. Timber building products manufactured for outdoor use in all.

The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Trimjoist is the marriage of an open web floor truss and a trimmable wooden i joist bringing the best features of each to the relationship. 2 grade of douglas fir are indicated below.

Maximum span of 2x12 floor joist the most important design choices to consider when building a home are the species and grade of wood that is being used as well as joist size and spacing. Dead load weight of structure and fixed loads 10 lbs ft 2. The width is considerably more important than the thickness of a board. Span calculator for wood joists and rafters also available for the android os.

As the name trimjoist indicates our product can be trimmed on the construction site for a custom fit. View joist rafter tables. Live load is weight of furniture wind snow and more. Internal floor joists f7 42mm 30 deck joists f7 42mm 31 deck bearers f7 32.

Live load 30 lbs ft 2 1436 n m 2. Maximum floor joist span for no. 1 ft 0 3048 m. All the figures are based on normal domestic floor loadings where the floor construction is typically 18 25mm floor boards sheets with up to 12 5mm thick plasterboard and skim underneath.

For example a joist made from doubled 2 x 6s can span a distance about 25 percent more than a single 2 x 6 but a 2 x 12 can span about 80 percent more than a 2 x 6 even though it has the same amount of wood as a doubled 2 x 6. Engineered wood products ewp span and size charts for bci joists. 1 in 25 4 mm. Span tables f7 rafters a maximum roof pitch of 25 degrees is assumed.